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Read off a graph to find half-life - see how long it takes to get to half it's original number eg http://bit.ly/joo57S #physicsgcse
Half life is a length of time which is fixd for an isotope so it doesn't matter how much u start with - it halves in that time #physicsgcse
So if you need to draw analogue or digital see for instance http://bit.ly/kO4PpJ #physicsgcse
Digital can only take 2 values usually 0 or 1 which means there's less interference and it can carry more info #physicsgcse
Analogue is a wave which can have any amplitude value, like 3 or 17.9 or 0.26 or ... #physicsgcse
Analogue vs digital - lots of scope for waffly answers which get you no marks #physicsgcse
All electromagnetic waves (1) travel at the same speed in a vacuum and (2) can travel through a vaccum #physicsgcse
gamma rays- come from unstable (radioactive) nuclei- sterilises surgical instruments, kills bacteria in food and treats cancer #physicsgcse
X rays for pictures of internal structures (bones, cracks in metal). Can cause cancer from prolonged exposure #physicsgcse
ultra violet for tanning and security marking. Can cause blindness and skin cancer from prolonged exposure #physicsgcse
visible light - what humans see - is used for anything we might be interested in seeing (eg cameras) also for communications #physicsgcse
Infrared heats things up, so is used for cooking. It's also used for remote controls and for communication using optical fibres #physicsgcse
radio waves - used for radios and TVs (but not satellite TV - that's microwaves, which are also used for mobiles and cooking) #physicsgcse
Learn that electromagnetic spectrum - low frequency to high frequency - radio waves, microwaves, IR, visible, UV, X, gamma #physicsgcse
'work done' is the phrase used to mean 'how much energy has been transferred' #physicsgcse
Acceleration has the units m/s squared. There's usually a mark for that #physicsgcse
Half life is an amount of TIME - how long it takes for half the radioactive nuclei to decay and for the count rate to halve #physicsgcse
When you charge something, you either remove electrons (and make it negative) or add electrons (making it positive). Period. #physicsgcse
Nuclear equations - much easier than chemical ones. -4 top number and -2 bottom for alpha and no change on top and +1 bottom for beta.
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